JP4812396B2 - Abnormality diagnosis system - Google Patents

Description

  The present invention relates to an abnormality diagnosis system, and more particularly, to an abnormality diagnosis system including a plurality of device control units that execute control of a predetermined device by supplying power, detect a power supply system failure, and store the information in a diagnosis.

Conventionally, an abnormality diagnosis system including a plurality of device control units that control in-vehicle devices and a diagnosis master control unit connected to each of these control units via a network is known (for example, see Patent Document 1). ). In this system, the diagnosis master control unit monitors the state of each device control unit, detects a device control unit having an abnormal operation state, and thereby collects diagnosis information of the device control unit.
JP 2004-17676 A

  By the way, when an abnormality such as voltage fluctuation, instantaneous interruption, or reduction occurs in the power supply system that supplies power to each device control unit, the power supply system abnormality can affect many device control units. In this regard, in the configuration in which the diagnostic master control unit simply collects diagnostic information of each device control unit as in the above system, when a power supply system abnormality occurs, a plurality of diagnostic information resulting from the power supply system abnormality is present. However, since the collected diagnostic information is not linked to each other, the operator can check the contents and location of the power supply system abnormality. Even if only one power supply system abnormality (for example, fuse blown due to overcurrent flow) occurs, the operator must check the collected diagnostic information of each device control unit one by one. May be required. Therefore, in the above system, there is a possibility that the diagnosis check becomes complicated in order to check the abnormality content and location from the collected diagnosis information.

  The present invention has been made in view of the above points, and an object thereof is to provide an abnormality diagnosis system capable of easily realizing a diagnosis check of a power supply system abnormality by a person.

Each of the above objects executes control of a predetermined device by being supplied with power from a power source through a power line, and detects a malfunction of a power system including the power source and the power line, and displays the malfunction information. An abnormality diagnosis system comprising a plurality of device control units for storing, provided for detecting a state of the power supply system based on a voltage generated at both ends of the power supply or a voltage generated on the power supply line and a power system control unit, based on a relationship between failure of the power supply system which is the diagnosis stored in the power supply system state and the device control unit is detected on the power supply system control unit, the contents of failure of the power supply system or includes a power supply system malfunction specifying means for specifying a location, wherein the power system fault identification unit, the power supply system control unit given above voltage fluctuation or predetermined When detecting a voltage drop downward and diagnosing that all the device control units have failed in the power supply system, it is determined that the power supply itself has caused an abnormal voltage fluctuation, In addition, when the power supply system control unit does not detect a voltage fluctuation of a predetermined value or lower or a voltage drop to a predetermined value or less, the device control unit stores a diagnosis that a failure of the power supply system has occurred. fuse blowing on instantaneous interruption or power supply lines in the power supply line is achieved by the abnormality diagnostic system that determines that occurred to the control unit.

  In this aspect of the invention, there are provided a plurality of device control units that execute control of a predetermined device by being supplied with power from a power source, and when the power system failure is detected, the failure information is stored in a diagnosis. In addition to the device control unit described above, a power supply system control unit is provided for detecting the state of the power supply system. By summarizing the power supply system failure detected by each device control unit as diagnostic information and the power supply system state uniquely detected by the power supply system control unit, the content or location of the power supply system failure can be specified. Therefore, as in the present invention, identifying the content or location of the power supply system failure based on the relationship between the power supply system status detected by the power supply system control unit and the power supply system failure stored in each device control unit; If this is done, it is possible to easily realize a diagnosis check of a power supply system abnormality by a person such as an operator.

In this case, in the abnormality diagnostic system described above, each of the device control unit transmits the fault information of the power supply system to which the diagnostic store to the power source system control unit, said power supply system control unit from the equipment control unit with collecting defect information of the power supply system is diagnostic stored and transmitted, the power supply system fault identification means is information collected to the state and the power supply system control unit of the power supply system is detected in said power supply system control unit that based on the relation between defect of the power system from the device control unit may be decided to identify the defect content or portions of the power supply system.

  In the abnormality diagnosis system described above, the power supply system control unit and the device control unit may be connected via multiple communication lines.

Furthermore, in the above-described abnormality diagnosis system, the power supply system failure specifying means is realized by the power supply system control unit, and the power supply system control unit is in accordance with a request from a diagnostic tester connected to the multiplex communication line. if sending outputs information indicating the failure of the contents or parts of the power supply system identified by said power system trouble identifying means to said diagnostic tester via said multiplexing communication lines, power supply system failure in accordance with a request from the diagnostic tester The information indicating the content or location can be presented to a person such as an operator via the diagnostic tester.

  ADVANTAGE OF THE INVENTION According to this invention, the diagnostic check of a power supply system abnormality by a person can be implement | achieved easily.

  FIG. 1 shows a configuration diagram of an abnormality diagnosis system mounted on a vehicle according to an embodiment of the present invention. In this embodiment, the vehicle is equipped with a power supply 10 that outputs a predetermined output voltage (for example, 12 volts). The power source 10 includes an in-vehicle battery having a predetermined capacity and an alternator that can generate power. The abnormality diagnosis system according to the present embodiment is a system for diagnosing a failure in a power supply system such as an in-vehicle power supply 10 and a power supply line (wire harness) connected to the in-vehicle power supply 10 or a fuse.

  A plurality (six in FIG. 1) of electronic control units (hereinafter, referred to as “equipment ECUs”) 14 for controlling in-vehicle devices as electric loads are connected to the in-vehicle power source 10 via a power line 12. Each device ECU 14 is supplied with power from the same in-vehicle power source 10 through the power line 12, and controls the corresponding in-vehicle device. The equipment ECU 14 is supplied with power from the in-vehicle power source 10 (particularly, the in-vehicle battery) even when the ignition is off (hereinafter referred to as the equipment ECUs 14a to 14c as shown in FIG. 1), and ignition on (IG on or ACC on). It is sometimes divided into those that are supplied with power from the in-vehicle power supply 10 (hereinafter, equipment ECUs 14d to 14f as shown in FIG. 1). In this classification, it is also possible to classify each of the equipment ECUs 14 having substantially the same operable voltage (for example, classification of 10 volts or more and less than 10 volts).

  A fuse 16 for preventing an overcurrent flow between the in-vehicle power supply 10 and the equipment ECUs 14a to 14c is interposed in the middle of the power line 12, and between the in-vehicle power supply 10 and the equipment ECUs 14d to 14f. A power supply switching relay 18 for switching between conduction and interruption between them and a fuse 20 for preventing an overcurrent flow between the in-vehicle power supply 10 and the equipment ECUs 14d to 14f are interposed.

  Among the equipment ECUs 14 that are supplied with power even when the ignition is off, for example, an anti-theft ECU that functions to prevent vehicle theft during parking, a door lock ECU that controls locking / unlocking of a vehicle door, This is a body ECU for switching on / off of a headlamp, tail lamp, and hazard lamp. In addition, as the power supply when the ignition is turned on, for example, an electric power steering ECU for realizing electric power steering, a skid ECU for performing skid control of a vehicle, and an air conditioner (air conditioner) for controlling An air conditioner ECU, an audio ECU for controlling audio, and the like.

  Each device ECU 14 is provided with a power supply voltage detection unit 22 connected to the + terminal side of the power supply line 12 and a diagnosis storage unit 24 connected to the power supply voltage detection unit 22. The power supply voltage detection unit 22 has a function of detecting a power supply voltage supplied from the in-vehicle power supply 10. The equipment ECU 14 detects the presence or absence of a power supply system failure such as a voltage fluctuation exceeding a predetermined level, a momentary interruption, or a voltage drop based on the supply power supply voltage detected by the power supply voltage detection unit 22. In addition, the presence or absence of a power supply system failure detected by each device ECU 14 may be detected using a different reference (threshold value) for each device ECU 14. When it is detected that a power supply system failure has occurred based on the power supply voltage detected by the power supply voltage detection unit 22, the diagnosis storage unit 24 stores diagnosis information indicating the power supply system failure. Note that, at the time of the diagnosis storage of the power supply system failure, information on the power supply voltage itself supplied to the device ECU 14 may be stored at the same time.

  Each device ECU 14 has a multiplex communication device 26 and is connected to each other via a multiplex communication line 28. The equipment ECU 14 can transmit its own information from the multiplex communication device 26 to the other equipment ECU 14 and a power supply system ECU 30 described later through the multiplex communication line 28, and multiplex communication of the information of the other equipment ECU 14 and the like through the multiplex communication line 28. It can be received by the machine 26. That is, information can be exchanged through the multiple communication line 28 between the plurality of device ECUs 14 and between the device ECU 14 and the power supply system ECU 30. The multiplex communication line 28 is a communication line through which information can be distributed according to a predetermined rule such as time division multiplexing.

  The abnormality diagnosis system of the present embodiment includes a power supply system ECU 30 provided to detect the state of the power supply system including the in-vehicle power supply 10, separately from the above-described equipment ECU 14. The power supply system ECU 30 also has a function of switching conduction / cutoff of the power supply line 12 by the power supply switching relay 18 as well as the state detection function of the power supply system. This power line switching function is realized by the relay drive unit 32.

  The power supply system ECU 30 includes a power supply voltage detection unit 34 connected to both ends of the in-vehicle power supply 10, and a relay output monitor unit 36 connected to the power supply switching relay 18 downstream side (equipment ECU 14 d to 14 f side) of the power supply line 12. . The power supply voltage detector 34 has a function of detecting a power supply voltage generated at both ends of the in-vehicle power supply 10. Based on the power supply voltage of the in-vehicle power supply 10 detected by the power supply voltage detection unit 34, the power supply system ECU 30 causes a voltage fluctuation more than a predetermined value or the power supply voltage is set to a predetermined threshold value (two in a stepwise manner). The power supply system state, such as whether it drops below, may be detected.

  Further, the relay output monitor unit 36 has a function of monitoring a voltage generated on the downstream side of the power supply switching relay 18 (on the equipment ECUs 14d to 14f side) of the power supply line 12. The power supply system ECU 30 mainly detects a switching abnormality of the power supply switching relay 18 based on the voltage monitored by the relay output monitor unit 36. For example, since the power supply switching relay 18 is turned on when the power supply line 12 between the in-vehicle power supply 10 and the equipment ECUs 14d to 14f is to be conducted, the monitor voltage at this time is a value in the vicinity of the desired voltage of the in-vehicle power supply 10. When it is, it is determined that the power supply switching relay 18 is functioning normally. On the other hand, when the monitor voltage does not become a value in the vicinity of the desired voltage, it is determined that a switching abnormality has occurred in the power supply switching relay 18. Further, since the power supply switching relay 18 is turned off when the power supply line 12 is to be cut off, it is assumed that the power supply switching relay 18 is functioning normally when the monitor voltage is a value near zero. On the other hand, when the monitor voltage does not become a value near zero, it is determined that a switching abnormality has occurred in the power supply switching relay 18.

  The power supply system ECU 30 includes a multiplex communication device 38 having the same function as the multiplex communication device 26 described above. The multiplex communication line 28 is connected to the multiplex communication device 38. Therefore, the power supply system ECU 30 can transmit its own information from the multiplex communication device 38 to each device ECU 14 connected to the multiplex communication line 28 and the like, and information on each device ECU 14 is transmitted to the multiplex communication device 38 through the multiplex communication line 28. It can be received. As will be described later, the power supply system ECU 30 collects diagnostic information of power supply system malfunctions from the respective equipment ECUs 14 through the multiplex communication line 28, and detects the power supply system malfunction diagnostic information from the respective equipment ECUs 14 by itself. Based on the power supply system failure or the state of the power supply system such as the power supply voltage itself of the vehicle-mounted power supply 10, information on the failure that occurred in the power supply system including the vehicle-mounted power supply 10 is collectively managed according to the time of occurrence, and the occurrence has occurred Identify the specific content or location of the power system failure.

  Further, a diagnostic tester 42 can be connected to the multiplex communication line 28 via a terminal 40. The diagnostic tester 42 is a device that is not normally connected to the multiplex communication line 28, but is connected to the multiplex communication line 28 via a terminal 40 by an operator's manual operation at a vehicle repair shop or service station. The diagnostic tester 42 has a function of requesting the power supply system ECU 30 to transmit diagnosis information related to a power supply system failure while being connected to the multiplex communication line 28, and a power supply system failure transmitted from the power supply system ECU 30. It has a function of receiving the diag information shown and presenting the received information to the operator through a display screen, audio output, or the like.

  Next, the operation of the abnormality diagnosis system of this embodiment will be described with reference to FIGS. FIG. 2 shows a flowchart of an example of a control routine executed in the abnormality diagnosis system of the present embodiment. FIG. 3 shows a specific table used to identify the contents and locations of power system malfunctions from the detection results regarding the power systems in the ECUs 14 and 30 in the abnormality diagnosis system of the present embodiment. In FIG. 3, the case where a normal detection result is obtained is indicated by a circle, and the case where an abnormal detection result is obtained (for example, a result indicating that there is a defect or a detection result due to poor transmission / reception). If there is no answer to, etc.) are indicated by a cross.

  In this embodiment, each of the device ECUs 14a to 14c is supplied with power from the in-vehicle power source 10 (in-vehicle battery) even when the ignition of the vehicle is off, and controls the corresponding in-vehicle device in that state. Further, each of the device ECUs 14d to 14f is supplied with power from the in-vehicle power source 10 when the vehicle ignition is on (IG on or ACC on), and controls the corresponding in-vehicle device in that state. Furthermore, each of the equipment ECUs 14a to 14f is in a state in which power is supplied from the in-vehicle power supply 10, and based on the power supply voltage supplied from the power supply line 12 detected by the power supply voltage detection unit 22, the voltage fluctuation or instantaneous It is determined whether or not a power supply system failure such as disconnection or voltage drop occurs.

  When it is detected that a power supply system failure has occurred as a result of the determination (step 100), the equipment ECU 14 stores information indicating that the power supply system failure has occurred in the diagnosis storage unit 24 (step 102). . Then, after performing the diagnosis storage, information indicating that the power supply system failure stored in the diagnosis is transmitted from the multiplex communication device 26 to the power supply ECU 30 through the multiplex communication line 28 together with the identification information of the own ECU 14 (step) 104). In addition, when transmitting the information indicating the power supply system failure, information on the time when the power supply system failure detected by the device ECU 14 may be transmitted.

  The power supply system ECU 30 receives information transmitted from each device ECU 14 and collects information related to the power supply system failure detected by the device ECU 14 in correspondence with the generation time or the reception time (step 200). The power supply ECU 30 uses the power supply voltage detector 34 and the relay output monitor 36 to detect a power supply system state such as a power supply voltage fluctuation or a power supply voltage drop of the in-vehicle power supply 10, and a switching abnormality of the power supply switching relay 18. The presence or absence is detected in correspondence with the time of occurrence.

  The power supply system ECU 30 does not proceed with any process when none of the device ECUs 14 detects a power supply system failure as a result of collecting information on the power supply system failure from each device ECU14. On the other hand, when it is detected that a power supply system failure has occurred in any one or more of the device ECUs 14, the presence / absence of power supply system failures in all the device ECUs 14 at the time when the power supply system failure has occurred is determined. The power supply voltage detection unit 34 and the relay output monitor unit 36 are used to detect the state of the power supply system including the in-vehicle power supply 10 and the presence or absence of switching abnormality of the power supply switching relay 18 at the occurrence time of the power supply system malfunction. Then, the specific contents of the power supply system failure and the location of the failure are identified from the comprehensive relationship of the detection results, and the information is stored in the memory (step 202).

  For example, as shown in FIG. 3, all the equipment ECUs 14 detect that a power supply system failure has occurred, and the power supply system ECU 30 detects that a power supply voltage fluctuation or a drop in the in-vehicle power supply 10 has occurred and By detecting the occurrence of the switching abnormality, the input power to each device ECU 14 becomes abnormal and the power voltage of the in-vehicle power supply 10 becomes abnormal at substantially the same time. Further, in response to the switching command to the power switching relay 18 When it is determined that the normal voltage does not appear, it is determined that the in-vehicle power supply 10 itself has caused a voltage fluctuation as a specific content of the power supply system failure, and the in-vehicle power supply 10 itself is the location of the power supply system failure. Car battery and alternator are listed.

  Further, only the equipment ECUs 14d to 14f connected to the in-vehicle power supply 10 via the power supply switching relay 18 detect that a power supply system failure has occurred, and the power supply system ECU 30 does not detect that a power supply abnormality of the in-vehicle power supply 10 has occurred. On the other hand, by detecting that the switching abnormality of the power supply switching relay 18 has occurred, the input voltage to the equipment ECUs 14d to 14f becomes abnormal at approximately the same time, and a normal voltage with respect to the switching command to the power switching relay 18 is obtained. When it is determined that it does not appear, it is determined that the instantaneous interruption of the input voltage to the equipment ECUs 14d to 14f has occurred as the specific content of the power supply system failure, and a switching failure is caused as the location of the power supply system failure. The power supply switching relay 18 that is assumed to be present is given.

  In addition, only the equipment ECUs 14d to 14f connected to the in-vehicle power supply 10 via the power supply switching relay 18 detect that a power supply system failure has occurred, while the power supply system ECU 30 does not detect any abnormality, so that the time is almost the same. When it is determined that the input voltage to the equipment ECUs 14d to 14f has become abnormal, it is determined that the fuse 20 on the equipment ECU 14d to 14f side is blown as a specific content of the power supply system trouble, As an example, a blown fuse 20 is given. Similarly, only the device ECUs 14a to 14c detect that a power supply system failure has occurred, but the power supply system ECU 30 has not detected any abnormality, so that the input voltage to the device ECUs 14a to 14c is abnormal at approximately the same time. When it is determined that the fuse has melted, it is determined that the fuse 16 on the side of the equipment ECU 14a to 14c has melted as the specific content of the power system malfunction, and the blown fuse 16 is given as the location of the power system malfunction.

  In addition, only one of the equipment ECUs 14 detects that a power supply system failure has occurred, while the power supply system ECU 30 does not detect any abnormality, so that the input voltage to one specific equipment ECU 14 becomes abnormal. If it is determined that the power supply line 12 is disconnected as a specific content of the power supply system failure, it is determined that the power supply line 12 is disconnected. A power supply system to be input to the ECU 14 will be listed.

  Thus, in the present embodiment, each device ECU 14 transmits diagnostic information indicating that a power supply system failure detected and stored by diagnosis to the power supply system ECU 30, and the power supply system ECU 30 receives information from each device ECU 14. Diagnostic information indicating that a power supply system failure has occurred is collected, and the state of the power supply system including the in-vehicle power supply 10 and the presence / absence of switching abnormality of the power supply switching relay 18 are detected to identify the content and location of the power supply system failure To do.

  A vehicle user checks a vehicle at a service station, a dealer, a repair shop, or the like when he / she thinks that a vehicle malfunction has occurred. In this embodiment, when a vehicle equipped with the in-vehicle power supply 10 is inspected, an operator such as a repair shop first attaches the diag tester 42 via the terminal 40 to the multiplex communication line 28 in order to perform a diag check. Connect to.

  After being connected to the multiplex communication line 28, the diagnostic tester 42 requests the power supply system ECU 30 to transmit information related to the power supply system failure stored in the power supply system ECU 30 by an operation by an operator. When the power supply system ECU 30 is requested to transmit information related to the power supply system failure from the diagnostic tester 42 connected to the multiplex communication line 28 (when affirmative determination is made in step 204), the power supply system ECU 30 actually stores the diagnosis information related to the power supply system failure. Sometimes, the information is transmitted to the diagnostic tester 42 through the multiplex communication line 28 (step 206).

  When the diagnostic tester 42 receives the information on the power supply system failure transmitted from the power supply system ECU 30 after making a transmission request for the information on the power supply system failure to the power supply system ECU 30, the received power supply system ECU 30 The specific contents of the identified power supply system failure and the information on the location are displayed on a display screen provided in the diagnostic tester 42 or output from a speaker and presented to the operator. In this case, the operator can know the specific content and location of the power supply system failure by watching or listening to the output / presentation of the diagnostic tester 42.

  As described above, in this embodiment, the power supply system ECU 30 transmits information indicating the specific contents and location of the power supply system failure identified by the power supply system ECU 30 in accordance with a request from the diagnostic tester 42 connected to the multiplex communication line 28. Is transmitted to the diagnostic tester 42, and the diagnostic tester 42 receives information indicating the specific content and location of the power supply system failure transmitted from the power supply system ECU 30 after the request to the power supply system ECU 30. The information is presented to the worker.

  Therefore, according to the abnormality diagnosis system of the present embodiment, the information on the power supply system failure detected by each device ECU 14 is collected in one power supply system ECU 30, and the power supply system ECU 30 also includes the in-vehicle power supply 10 itself and the power supply switching relay. By detecting the power supply system state of the 18 switching abnormalities, it is possible to specify the specific contents and location of the power supply system failure from the comprehensive relationship of the collected / detected information. When an abnormality has actually occurred in the power supply system, the power supply system ECU 30 can present the specific contents of the power supply system failure and information on the location to the operator via the diagnostic tester 42.

  For example, in a system (hereinafter referred to as a comparison system) in which each device ECU 14 individually transmits diagnosis information related to a power supply system failure to the diagnostic tester 42 and presents each diagnostic information individually to the operator (hereinafter referred to as a comparison system), the diagnostic information is collected by the diagnostic tester 42. In addition, since the diagnosis information of the power supply system failure of each device ECU 14 is not linked to each other, one power supply system abnormality (for example, due to the overcurrent distribution) Even if a fuse blowout occurs, not only a location where the abnormality has occurred (fuse blowout) but also a location where no abnormality actually occurs (for example, disconnection of the power supply line 12 connected to each device ECU 14, etc.) ) May need to be checked by the operator one by one.

  On the other hand, in the abnormality diagnosis system of the present embodiment, as described above, the power supply system ECU 30 provided separately from the device ECU 14 that controls the in-vehicle device collects information on the power supply system failure from each device ECU 14, By independently detecting the status of the power supply system including the in-vehicle power supply 10 and the power supply switching relay 18, the collected information and the power supply system status are collectively managed, and the power supply system failure is determined from the comprehensive relationship of the information. Since the specific contents and location are specified, and information on the specified power supply system failure is transmitted to the diagnostic tester 42 according to the request and presented to the operator, the operator is compared with the above comparison system. Makes it easier to identify the contents of power supply system abnormalities, and it is easier to identify faulty parts of the power supply system that should be repaired or replaced. There is no need to Ekku, it is possible to eliminate the need to perform a diagnostic check of the power supply system.

  In this regard, according to the abnormality diagnosis system of the present embodiment, it is possible to reduce the man-hours for the operator to analyze the power system abnormality and the man-hours to repair the abnormal part, so that the operator can easily check the power system abnormality. Therefore, it is possible to improve the efficiency of diagnosis check.

  In the above embodiment, the in-vehicle power source 10 is in the “power source” described in the claims, the device ECU 14 is in the “device control unit” in the claims, and the power system ECU 30 is in the claims. The multiplex communication line 28 corresponds to the “multiplex communication line” described in the claims, and the power supply system ECU 30 receives a power supply system failure from each device ECU 14. While collecting information indicating the occurrence, the state of the power supply system including the in-vehicle power supply 10 and the presence / absence of switching abnormality of the power supply switching relay 18 are detected, and the specific contents of the power supply system failure from the comprehensive relationship between them By specifying the location, the “power supply system failure specifying means” described in the claims is realized.

  By the way, in said Example, power supply system ECU30 which detects the state of the vehicle-mounted power supply 10 provided separately from apparatus ECU14 which controls vehicle-mounted apparatus, and the power supply switching relay 18 produced the power supply system malfunction from each apparatus ECU14. Is collected via the multiplex communication line 28, and the state of the power supply system including the in-vehicle power supply 10 and the presence / absence of switching abnormality of the power supply switching relay 18 are detected. In addition, the specific content and location of the specified power supply system failure are specified, and the specific content and location information of the specified power supply system failure are transmitted to the diagnostic tester 42 connected to the multiplex communication line 28. The power supply system ECU 30 is not limited to the information collected from each device ECU 14 indicating that a power supply system malfunction has occurred, and the detected time at the same time. The power supply system including the in-vehicle power supply 10 and the information on the presence / absence of switching abnormality of the power supply switching relay 18 are collectively managed and transmitted to the diagnostic tester 42 connected to the multiplex communication line 28, and then the diagnostic tester 42 itself However, when the information transmitted from power supply system ECU30 is received, it is good also as specifying the specific content and location of a power supply system malfunction from the comprehensive relationship of those information.

It is a block diagram of the abnormality diagnosis system which is one Example of this invention. It is a flowchart of an example of the control routine performed in the abnormality diagnosis system of a present Example. It is a table | surface of an example used for specifying the content and location of a power supply system malfunction from the detection result regarding the power supply system in each control unit in the abnormality diagnosis system of a present Example.

Explanation of symbols

10 On-vehicle power supply 12 Power supply line 14 Equipment ECU
22, 34 Power supply voltage detection unit 24 Diagnostic storage unit 28 Multiple communication line 30 Power supply system ECU
36 Relay output monitor 42 Diag tester

Claims (4)

A plurality of devices that execute control of a predetermined device by being supplied with power from a power source through a power line , detect a failure of the power supply system including the power source and the power line, and store the failure information in a diagnostic manner An abnormality diagnosis system comprising a control unit,
A power supply system control unit provided for detecting a state of the power supply system based on a voltage generated at both ends of the power supply or a voltage generated in the power supply line ;
Based on the relationship between the failure of the power supply system which is the diagnosis stored in the power supply system state and the device control unit is detected on the power supply system control unit, a power supply system for identifying a defect in the contents or parts of the power supply system A defect identification means ,
The power supply system failure identification means is configured to detect that the power supply system control unit has detected a voltage fluctuation of a predetermined value or lower or a voltage drop to a predetermined value or less, and that all the device control units have failed of the power supply system. When storing, it is determined that the power supply itself has caused an abnormal voltage fluctuation, and the power supply system control unit does not detect a voltage fluctuation more than a predetermined value or a voltage drop to a predetermined value, while the device control unit characterized but that you determined that a malfunction of the power supply system when that diagnosis store that has occurred, blown fuses on an instantaneous interruption or power supply lines in the power line to the instrument control unit has occurred An abnormal diagnosis system. Each device control unit transmits the fault information of the power supply system to which the diagnostic store to the power source system control unit,
Together with the power supply system control unit collects fault information of the power supply system is diagnostic stored is transmitted from the device control unit,
The power source system malfunction specifying section, based on the relationship between the failure of the power supply system from the device control unit which is information collected to the power system state and the power supply system control unit to be detected to the power supply system control unit, The abnormality diagnosis system according to claim 1, wherein a content or location of a malfunction of the power supply system is specified.   The abnormality diagnosis system according to claim 2, wherein the power supply system control unit and the device control unit are connected via a multiple communication line. The power supply system failure identification means is realized by the power supply system control unit,
Said power supply system control unit in accordance with a request from the diagnostic tester is connected to the multiplex communication line, the information indicating the failure of the contents or parts of the power supply system identified by said power system trouble identifying means via said multiplexing communication line The abnormality diagnosis system according to claim 3, wherein the abnormality diagnosis system transmits the output to the diagnostic tester.

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